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並前往https://web.viu.ca/krogh/chem311/Units%20of%20Concentration%20w%20answers%202008.pdf

There are a number of different ways of expressing solute ...

Mass per volume, mg/L = mass of solute/liter of solution ... Dilute Aqueous Solutions ppm mg/kg ug/g mg/L ppb ug/kg 1 ng/g ug/L ng/ml pptr ng/kg.

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